set theory 21408

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Across
  1. 1. very important principle used to solve problems
  2. 4. number of elements in the set
  3. 5. when we multiply 2 sets
  4. 7. subsets of all elements in a set
  5. 8. when a set remains the same even after performing operations on it with itself
  6. 10. property to prove equivalence of 2 expressions
Down
  1. 2. equation form of elements
  2. 3. a statement with truth value
  3. 6. unordered collection of elements
  4. 9. matchematical for of expressing english statements to logical expressions